Rotary engine.



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I. P. PARMENTER. ROTARY ENGINE APPLICATION FILED JUNE 1.1904.

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PATENTED JAN. 3, 1905.

I. F. PARMENTER.

ROTARY ENGINE.

APPLICATION FILED JUNE 1.1904.

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No. 779,308. PATENTED JAN. 3, 1905.

- I. F. PARMENTER.

ROTARY ENGINE. APPLICATION FILED JUNE 1,1904.

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ROTARY ENGINE.

APPLICATION FILED JUNE 1.1904.

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I. P. PARMENTER. ROTARY ENGINE.

APPLICATION FILED JUNE 1.1904.

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I. I. PARMBNTER. ROTARY ENGINE.

APPLICATION FILED JUNE 1.1904.

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I. F. PARMENTER. ROTARY ENGINE.

APPLICATION FILED JUNE 1.1904

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'llllllufili //v VENTOH 3 a -l Ira aczfarm enter UNITED STATES Patented January 3, 1905.

PATENT OFFICE.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 779,308, dated January 3, 1905.

' Application filed June 1, 1904. Serial No. 210,630.

To all whom, it may concern.-

Be it known that I, IsAAo FOWLER PARMEN- TER, a citizen of the United States, and a resident of Berlin, in the county of Worcester and State of Massachusetts, have invented a new and Improved Rotary Engine, of which the following is a full, clear, and exact description.

My invention relates to rotary engines, my more particular object being to produce a type of reversible engine possessing certain ad vantages in the distribution of the steam.

Reference is to he had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a front elevation of the engine, partly broken away for the sake of clearness. Fig. 2 is a horizontal section upon the line 2 2 of Fig. 1 looking in the direction of the arrow. Fig. 3 is a front elevation of the engine with the closure member 2 removed. Fig. 4: is a vertical section upon the line 4 4: of Fig. 1 looking in the direction of the arrow. Fig. 5 is a section upon the line 5 5 of Fig. 3 looking in the direction of the arrow. Fig. 6 is a fragmentary front elevation, certain parts being removed so as to exhibit the inner wall of the casing and a portion of the reversing-ring. Fig. 7 is a section upon the line 7 7 of Fig. 1 looking in the direction of the arrow. Fig. 8 is a fragmentary section on the line 8 8 of Fig. 1 looking in the direction of the arrow. Fig. 9 is an enlarged detail view of the reversing-cam removed from the casing. Fig. 10 is a fragmentary section upon the line 10 10 of Fig. 2 looking in the direction of the arrow. Fig. 11 is a detail section upon the line 11 11 of Fig. 1 looking in the direction of the arrow and showing one of the cam-disks and its appurtenances. Fig. 12 is a detail section upon the line 12 12 of Fig. 11 looking in the direction of the arrow. Fig. 13 is a section on the line 13 13 of Fig. 12 looking in the direction of the arrow. Fig. 14: is a plan view of the governor-ring. Fig.

15 is a plan view of the reversing-ring 90. Fig. 16 is a similar view of the distributingring 9 1. Fig. 17 is asectional plane development of the inner wall 87, reversing-ring 90, distributing-ring 94E, revoluble disk 59, and

governor-ring 10 1, these parts being shown in the relative positions indicated in Figs. 2 and 3, the plane of development as affecting the reversing-ring 90 being taken upon the line 00 a of Fig. 15 and as affecting the distributing-ring upon the line 2 y of Fig. 16. Fig. 18 is a somewhat similar development, but showing the distributing-ring 9&1 moved to its opposite extreme position attained by rotating the ring slightly in a contra-clockwise direction from its position indicated in Figs. 1 and 16. Fig. 19 is a plan view of the packing-rings. Fig. 20 is a view of the metallic member 4:1,formingpart of the packing-rings; and Fig. 21 is an enlarged section upon the line 21 21 of Fig. 19 looking in the direction of the arrow. Fig. 22 is a fragmentary perspective view showing one of the ends of a divided packing-ring. Fig. 23 is a somewhat similar view of the mating end of this packing.

Upon a base 1 is mounted a front casing-wall 2 and a rear casing-wall 2, provided, respectively, with brackets 2, having bearing-rings 2 mounted thereupon. A front head or closure member 2 is provided with a stuffing-box 2, the rear wall 2 beingsomewhat similarly provided with a stuffing-box 2. This closure member 2 is secured in position by means of bolts 2 A stuffing-box 2 is provided at the top of the casing 2. An inlet-pipe 2 is used for supplying the engine with steam. A pair of revoluble shafts 3 4 are provided, respectively, with bevel-gears 5 6, which engage an intermediate bevel-gear 7. The outer ends of the shafts 3 tare provided with bevel-gears 9 10. The shafts 3 4 are supported by bearing-brackets 11 12 1112. Annularbearings 13 14 are bolted rigidly upon the outer ends of sliding shafts 15 16. Disks 13 14 are mounted upon guide-rods 17 18, which pass loosely through bevel-gears 19 20. Theinner ends of the guide-rods 17 18 are connected rigidly with the respective cam-disks 21 22, which are used for reversing and are adapted to rock. Each bevel-gear 19 20 is provided with a sleeve 20 of substantially triangular cross-section, integral therewith, as indicated in Fig. 12, and is also provided with a neck 20 and a flange 20 These necks 20 are encircled by the bearing rings 2, which, as

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above stated, are mounted upon the brackets 2 The cam-disks 21 22 are provided, respectively, with slots 21 21 22 22, having the shape shown more particularly in Figs. 1 and 11.

The engine is provided with spring valveplugs 24 25 26 27, which are adapted to open and close the ports 28, 29, 30, and 31. These valve-plugs are provided with bearing ends 32 32 33 33 for the purpose of engaging the inner surfaces of the cam-disks 21 22 or for entering the slots 21 21 22 22" of these camdisks, according to the relative position of the cam-disks and bearing ends, as indicated in Fig. 1. The exhaust-pipes are shown at 35 36 and are connected with the exhaustchambers 36, which are in direct communication with the ports 28, 29, 30, and 31. The annular cylinder or main steam-compartment is shown at 37 and is fitted with a piston 38. fixedly mounted upon a revoluble disk 39, this disk in turn being rigid upon the revoluble shaft 40. The packings are shown at 41 and are substantially triangular in cross-section. A two-part metallic ring 41is provided with a countersink 41, into which fit saddles 41 each saddle being secured at one end by fastenings 41, its other end loosely engaging one of the countersinks 41, thus forming a lap-joint, the efficiency of which is increased by a tongue 41, entering a groove 41 as indicated more particularly in Fig. 21. The packing 41 is made in halves, as shownin Fig. 14. Elliptical rings 42, of metal, are connected with opposite sides of the packing 41, as indicatedin Fig. 19.

Within the casing 2 are slideways 43 44, fitted with slides 45 46, movable therein, these slides being rigidly connected with the sliding shafts 15 16.

Mounted within brackets 47 48 are sliding rods 49 50, carrying rollers 51 52, and engaging these rollers is a revoluble cam 53, provided with a groove 53, the cam being mounted rigidly upon the revoluble shaft 40. Pulleys 54 55 are rigidly connected with the revoluble shaft 40 and are used for transferring power from the engine to any point desired in the usual manner. A collar 56 engages the stufling-box 2", as indicated more particularly in Figs. 3 and 4.

A hand-wheel 8 is mounted upon a shaft 8, revoluble therewith, for the purpose of turning the bevel-gears 5 6 and also turning a small gear-wheel 57. (Shown more particularly in Fig. 4.) The object of this gearwheel 57 is to turn the reversing-ring 90 back and forth within certain limits for the purpose of reversing the engine, as hereinafter explained.

A revoluble disk 59 (shown to better advantage in Fig. 3) is mounted rigidly upon the shaft 40 and is provided with pivots 60 61, carrying levers 62 63, and also shutters 64 65, operated by these levers.

shutters 64 65.

The shutters are 1 provided with slots 66 67, through which pass guide-pins 68 for the purpose of enabling the shutters to move outwardly from the shaft 40 or inwardly toward the same. The pivotal screws 69 engage the slots 7 0 of the levers 62 63 and are secured rigidly within the Leaf-springs 71 are mounted upon the disk 59 and engage the notches 72 upon the shutters 64 for the purpose of maintaining the same in definite positions, as shown more particularly in Fig. 3. When the slides are moved radially outward or inward to a distance limited by the length of the slots 66 67, the springs 71 simply click into the appropriate notches 72, and thus maintain the slides temporarily in position.-

Mounted upon a pivot 73 and carried by the revoluble disk 59 are toggle-levers 74, engaging the levers 62 and 63. The pivot 73 is connected with a slide 76, which carries arcuate bearing members 77 78, oppositely disposed, as shown in the lower portion of Fig. 3. A revoluble head 79 is provided with a lug 80, disposed eccentric thereto, as indicated in the lower portion of Fig. 4. This head is mounted upon a stem 81 and controllable di rectly by a hand-wheel 82. By turning the hand-wheel the lug can readily be brought into its uppermost or into its lowermost position, as desired. When in its lowermost position, it is engaged by the arcuate member 78,

(see Fig. 3,) and as the lug cannot move upward and the arcuate member 78 is rigidly connected with the slide 76 the slide is of course drawn downward, whereas if the hand-wheel 82 be so turned as to bring the lug 80 into its uppermost position it is engaged by the arcuate bearing member 77 and moves the slide 7.6 upward. When the slide 76 moves downwardly, it brings the toggle-levers 74 into the position indicated in Fig. 3, thereby forcing thelower ends of the levers 62 63 apart and drawing the shutters 64 65 toward each other, or rather toward the shaft40. The opposite movement of the slide 7 6. due to a different position of the lug 80 and hand-wheel 82, forces the shutters outward and away from the shaft 40, so as to temporarily cover the slots 84 and 86. The slots 83 and 85 are of similar dimensions to -those numbered 84 and 86 and are disposed relatively thereto, as indicated in Fig. 3. The inner wall 87 of the casing is provided with an inner circle of holes 88 and with an outer circle of holes 89. These holes are equidistant and staggered relatively to each other, as indicated in Fig. 6. The holes 88 of the inner circle are employed successively in driving the engine in a contra-clockwise direction, whereas the holes 89 are employed when the direction of rotation is clockwise, as seen in this figure. The reversing-ring 90 is provided with holes 91 92, disposed as shown in Fig. 15. This ring is moved by rotation of the gear-wheel 57, which meshes with the toothed sector 93. The operator, therefore, by turning the hand-wheel 8 to the right or to the left may shift the position of the reversingring 90 within certain limits, as will readily be seen from Fig. 6. With the parts in the position indicated in this figurethat is to say, with the reversing-ring 90 moved to its extreme limit in a contra-clockwise direction-the holes 92 of the outer circle of the ring 90 are brought into alinement with the holes 89 of the outer circle of the wall 87, whereas by turning the hand-wheel 8 in a clockwise direction,as seen looking downward upon it, the sector 93 (shown in Fig. 6) is shifted slightly to the left, so that the holes 91 of the ring 90 are caused to aline with the holes 88. The result is that a movement of the handwheel 8 in one direction closes all of the holes 88 and opens all of the holes 89, whereas a movement of the wheel 8 in the opposite direction closes all of the holes 89 and opens all of the holes 88. If desired, the ring 90 may be brought into such position as to only partially aline with the holes, as above described, thereby temporarily curtailing the capacity of the engine to take steam.

The distributing-ring 94 is shown more particularly in Fig. 16. This ring is likewise provided with holes arranged in inner and outer circles, the outer circle being used when the direction of rotation of the engine is clockwise, as seen in Fig. 1, the inner circle being used when the direction of rotation is contraclockwise. The distribution of the holes in the distributing-ring is as follows: First, there is a single hole 95, then two holes 96, three holes 97, four holes 98, a single hole 95, two holes 96*, three holes 97 and four holes 98. This completes the inner circle. Similarly, the outer circle is made up as follows: a single hole 99, two holes 100, three holes 101, four holes 102, a single hole 99 two holes 100, three holes 101, and four holes 102 This distributing-ring 94 is provided with a sector 103, which is engaged by a gear-wheel 104", carried by the revoluble shaft 105, actuated by a hand-wheel 106. By turning the hand-wheel, and consequently turning the gear-wheel 104, the distributing ring 94 may be turned slightly,somewhat after the manner of the ring 90, above described. The purpose of the distributing-ring 94 is to admit steam to the engine through one, two, three, or four holes, as may be desired, in each half-revolution of the piston. When the distributing-ring 94 is moved in a contra-clockwise direction to its extreme limit, as indicated by the position of the sector 103 in Fig. 3, the ring 90 meanwhile occupying the position indicated in Fig. 6, the lowermosthole of the group 102 and the uppermost hole of the group 102 are caused to aline with the two of the holes 92, all other holes being closed, as will be seen from examining the development shown in Fig. 17. If now the distributing-ring 94 be moved very slightly in a from the bottom of group 102, the middle hole of group 101, theleft-hand hole of group 100, the third hole from the top of group 102, the middle hole of group 101, and the right-hand hole of the group 100. The ring 94 being now moved still farther in a clockwise direction, so as to reach its extreme position, brings into registry with the holes 92 eight holes of this ring 94, as follows: the uppermost holes of the groups 102 and 101, the right-hand hole of the group 100, the single hole 99, the lowermost holes of the groups 102 and 101, the left-hand hole of the group 100, and the single hole 99. This brings the maximum number of holes in the rings and 94 into register with each other, as may be seen from Fig. 18. The inner and outer circles of the holes in the distributingrings 90 and 94 are substantially duplicates of each other. It follows, therefore, that by reversing the position of the ring 90 the holes 91, making up the inner circle, can be caused to register substantiallyas above described, but in reversed order. By comparing Figs. 17. and 18 it will be seen that two, four, six, or eight holes of the distributing-ring 94 may be caused to register with two, four, six, or eight of the holes 92 in the ring 90 and that the holes in this ring may meanwhile be in alinement with the holes 89 of the inner wall 87 of the casing.

The governor-ring 104 is provided with a series of holes 105 106, arranged concentrically in circles, and is further provided integrally with a rack 106 which is engaged by a sector 107. This sector is integrally mounted upon a lever 110, which is pivoted upon a pin 108 and provided with a portion 109, which slidably enters a slot 111 in averticallymovable cam 112, integrally mounted upon the lower end of the cam-rod 113. Centrifugal balls 114 are connected with the cam-rod in the manner well known with reference to the action of governors and are rotated by bevel-gears 115, shaft 116, pulley 117, belt 118, and pulley 119, thelast-mentioned pulley being rigid upon the shaft 40 and revoluble therewith. hen the engine speeds up to an undesirable degree, the balls 114 fly outward and depress the cam-rod 113, thus causing the sector 107 to slightly rotate the governor-ring 104. The outer holes 106 of this ring normally register with the outer holes 89, and the inner holes 105 normally register with the holes 88 of the wall 87, the engine being at slow speed. When, however, the governorring 104is turned slightly, as above described, all of its holes are thrown partially out of registry with the holes in the inner wall 87 No matter, therefore, whether the direction of rotation be ahead or backward the governor acts according to speed and chokes off the excess of steam.

The general operation of my invention is as follows: Suppose the parts are in the position indicated in Figs. 1, 2, and 3. The handwheel 8 is moved into its extreme left-hand position, the sector being as far as possible to the right, as shown more particularly in Fig. 3. This movement of the hand-wheel 8 has just caused the bevel-gears 19 and 20 to move into such position that the slots 21 and 22 permit the entrance of the bearing ends 32 33 of the spring-valve plugs 24 and 27. The result is that the ports 28 and 31 are closed, whereas the ports 29 and 30 are open, but are free to close upon the outward movements of the respective cam-disks 21 and 22. The parts are now in such position thatif the steam be turned on the engine will go ahead in a clockwise direction. The uppermost hole of the group 102 and the lowermost hole of the group 102 are the only two holes capable of admitting steam into the cylinder, owing to the relative positions of the rings 90 and 94. (See Fig. 17.) The steam would pour freely through these holes except for the action of the revoluble disk 59. As will be seen from Fig. 3, the slots 83 84 afford the only means whereby steam can be admitted with the disk 59 in the position indicated, for the reason that the group of holes 102 is covered up, as indicated by dotted lines at the right of Fig. 3. The revoluble disk 59 is now just on the verge of letting steam pass through the slot 83 into the cylinder. The piston 38 is now in its uppermost position, as indicated in Fig. 1. As soon as the disk 59 rotates a little farther in a clockwise direction steam enters through the group of holes 102 and passes into the cylinder, where it exerts pressure upon the piston, driving the same around. If it be desired to operate the cut-off, the h andwheel 82 is turned so as to move the shutters 64 outward or away from the shaft 40,'as above described. When this is done, the shutter 64 closes the slot 84, so that as soon as the slot 83 passes upwardly and beyond the uppermost hole of the group 102 the steam must finish the stroke by virtue of its own expansion. The slots 85 and 86 have a similar function as the slots 83 84, but are used for propelling the engine in the opposite direction. N o steam can get through these slots to the cylinder until the reversing-ring is turned, as elsewhere described. When the disk 59 makes a half-turn, so as to bring the slot 83 over the lowermost hole of the group 102, the same action takes place as above described to wit, the steam is admitted through the slot 83 and the hole 102 to the cylinder. \Vith the parts 'in the position indicated in Fig. 3 the ex-' haust takes place through the open ports 29 30, the other ports being unable to open until the engine is reversed. As soon as the piston 38 reaches its lowermost position, which it will do in the course of a half-turn, the camroller 51 will have caused the withdrawal of the slide 45, thereby allowing the piston to pass upwardly, the ports 29 30 being momentarily closed by the same movements. With the piston 38 in its lowermost position the steam is supplied at a point just below the slide 46, whereas with the piston in its uppermost position, as indicated in Fig. 1, the steam is supplied just above the slide 45, assuming, of course, that the steam is entering at one point in the upper half of the engine and at one point in the lower half thereof. If the steam be supplied at two, three, or four points in each of the upper and lower halves of the engine, it enters six holes successively, beginning at the slide 45 and counting upward and to the right and at the slide 46 counting downward and to the left. The slides do not close immediately behind the piston, and there is considerable space between the piston and the slide in the rear thereof when this slide is closed. This makes no difference, however, for the reason that the intermediate space is filled with live steam. It will be noted that with a full head of steam-that is to say, with steam capable of entering at four points in the upper half of the engine and at four points in the lower half thereofthe steam never enters but one hole at a time. The difference between a minimum and a maximum flow of steam is found in the fact that with a single hole a little steam is admitted and the piston is driven a half-turn by the expansion of this steam, whereas if a full head of steam be on the steam is admitted at a number of points successively. Depending upon the position of the shutters, as above explained, the engine, whether running with a full head of steam or only with a partial head and whether running forward or backward, may run to some extent by virtue of the expansion of the steam. here a full head of steam is employed, the live steam enters the first hole, this hole being then closed. The steam next enters a second hole, which is in turn closed, and so on until the steam has been admitted successively at four points in each half of the engine. WVith a full head of steam on and with the shutters 64 65 moved outwardly the engine will run either forward or lbackward, taking on steam one half of the time and run by virtue of expansion the other half of the time. With the steam-head reduced to a minimum-that is to say, entering the top at a single point only and the bottom at a single point onlythe great bulk of the revolution in either direction is executed upon expansion only. This is especially true if the shutters 65 be thrown outward, as above ICC described. In this event the only time during which the engine takes steam is while the slot 83 or 85 is passing over one oftwo oppositelydisposed points, located, respectively, in the top and bottom of the engine. I/Vhen a full head of steam is used, one hole begins to open at practically the same moment when the one above it begins to close. It will be seen, therefore, that the revoluble disk 59, the reversing-ring 90, and the distributing-ring 94L, taken in connection with the governor-ring 1 and the inner wall 87 of the casing, constitute a sort of steam-chest controlling the distribution of steam into the engine, the chief factor for this purpose being the distributing-ring 94. WVhen the engine is running ahead, each time the roller 51 or 52 moves outwardly the annular bearings 13 1 1 disengage the disks 13 14, and the springpressed valve-plugs 26 are therefore free to move outwardly and close their respective ports. The result is that the ports 29 30 are periodically opened and closed, whereas the ports 28 and 31 remain closed so long as the engine is set to run in the direction indicated. Vice versa, when'the engine is so set as to run backward the ports 29 and 80 are temporarily closed, whereas the ports 28 and 31 are opened and closed periodically. The positions of the cam-disks 21 and 22 therefore govern the opening and closing of the ports in so far as the direction of rotation is concerned.

The action of the governor is quite simple and is described above. The governor-ring 104 being immediately adjacent to the inner wall 87 chokes off the steam at a point or a series of points very close to the steam-cylinder, so as to reduce to a minimum the loss due to expansion before the steam reaches the seat of its work.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent- 1. In a rotary engine, the combination of a casing, mechanism connected therewith and provided with a plurality of port-holes arranged in a circle, a distributing-ring provided with holes arranged in groups, the number of holes of one group being greater than that of another group, and means for bringing the holes of the distributing-ring into registry with said first-mentioned holes and for turning said distributing-ring within certain limits for the purpose of controlling the number of holes thus brought into registry.

2. In a rotary engine, the combination of a plurality of ports, movable valve-plugs for opening and closing the same, a cam-disk provided with slots for engaging said valve-plugs, and means for partially rotating said cam-disk for the purpose of bringing said slots into or out of alinement with said valve-plugs.

3. In a rotary engine, the combination of a port, a movable valve-plug for opening and closing the same, means for tensioning said valve-plug so as to normally close said port, a cam-disk engaging said valve-plug, said camdisk being provided with a slot, means for causing said cam-disk to reciprocate in the general direction of said valve-plug so as to cause the same to open and close said port, and means for shifting the position of said cam-disk so as to bring said slot into or out of alinement with said valve-plug.

1. In a rotary engine, the combination of a member provided with a plurality of holes adapted to admit steam or the like, said holes being disposed in the form of a circle, a distributing-ring movable relatively to said mem' ber and provided with a plurality of holes arranged in groups, the number of holes in one group being greater than that in another group, all of said groups being disposed in the general form of a circle, and mechanism for partially turning said distributing-ring so as to bring one, two, three or more holes thereof into registry with a corresponding number of holes in said member, the degree of rotation of said distributing-ring determining the number of holes thus brought into registry, so as to control the supply of steam or the like.

5. In a rotary engine, the combination of mechanism provided with holes for admitting steam to a cylinder, a revoluble member engaging said mechanism and provided with slots, and means controllable at will for covering and uncovering one of said slots for the purpose of allowing steam, admitted through said slots, an opportunity to expand.

6. In a rotary engine, the combination of a casing provided with mechanism to be actuated by pressure, and further provided with a plurality of holes disposed in the form of a circle, means for opening and closing said holes independently of each other, a revoluble member engaging said mechanism and provided with slots adapted to pass over said holes, shutters disposed adjacent to divers of said slots and movable relatively thereto for the purpose of covering and uncovering the same, and means controllable at will for shifting the position of said shutters relatively to said last-mentioned slots for the purpose of allowing the motive agent admitted through said slots, an opportunity to expand.

7. In a rotary engine, the combination of a casing provided with an inner wall having holes therethrough, a reversing-ring movable relatively to said wall and disposed against the same, said reversing-ring being provided with two concentric circles of holes, a distributingring disposed adjacent to said reversingring and provided with holes disposed in groups, the arrangement being such that the holes in said reversing-ring and said distributing-ring may be brought into register with the holes of said inner wall, and a revoluble member movable relatively to said inner wall, said reversing-ring and said distributing-ring, said revoluble member being provided with slots for successively uncovering the holes thus brought into register with each other.

8. In a rotary engine, the combination of a casing, a piston mounted within said casing and free to rotate relatively thereto, a packing member provided with a surface for engaging said piston, and a member engaging said packing member for holding the same in position, said member being made of metal and of substantially V shape in cross-section.

9. In a rotary engine, the combination of an annular cylinder, a piston mounted therein and movable relatively thereto, mechanism connected with said piston and adapted to be actuated thereby, a slide movable relatively to said cylinder and adapted to open and close the same, a slide-rod connected with said slide for actuating the same, cam mechanism for actuating said slid e-rod, a gear-wheel provided with a sleeve and loosely mounted upon said slide-rod, a cam-disk loosely connected with said gear-wheel and with said sleeve, means for partially rotating said gear-wheel and said cam-disk, the arrangement being such that said cam-disk is movable together with said gear-wheel, ports provided with mechanism to be opened and closed by movements of said cam-disk, and means for actuating said gearwheel.

10. In a rotary engine, the combination of a member provided with holes for admitting steam to the interior of the engine, a distributing member disposed adjacent thereto and provided with holes, means controllable at will for moving said distributing member so as to cause divers of said holes thereof to register with said first-mentioned holes, and a revoluble member for admitting steam successively into the holes of said distributing member.

11. In a rotary engine, the combination of mechanism provided with holes for admitting steam successively therethrough into the interior of the engine, a revoluble member for opening and closing said holes successively, a shutter mounted upon said revoluble member, and means controllable at will for shifting the position of said shutter while said revoluble member is in action.

12. In a rotary engine, the combination of a casing, a revoluble disk mounted therein, said casing and said disk being cut away so as to leave channels substantially V-shaped in crosssection, packings of substantially V shape in cross-section disposed within said channels, said packings being provided with steam-tight joints, slides adapted to move toward and from said revoluble disk, means for actuating said slides, a piston mounted upon said revoluble disk, and means for introducing an expansive agent between said slide and said piston and for discharging said expansive agent.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ISAAC FOWLER PARMENTER.

Witnesses:

EUGENE O. PRATT, EDWARD P. SAw'rELL. 

